exam Maths Puzzle Numerical Ability

Pleae help to

Show that 0.00315 is a rational number by writing it as a fraction of integers

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exam Other Question

Let f(x) = -x - 5 and g(x) = 2x + 3

g(0)

Help with this equation would be appreciated.
can someone please help me i am no good with quadratics i have been practicing for a week and feel that i am wrong.

x^2=-5x+8
(x+3)(x+4)=0
x=-3
x^2=16
x^2=16=0